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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a188f1ecce6c4b2875dd0a11894a0e377b0ec88aed2a8cfa2ba0673056f7ff' 
  AND token = 'S/ariO72fSqev1lcM8dVm2EVdtvyKTeMwm+lSgta6d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}