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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78bab24205da4240a69344a0a6d87a82765088e1da37c49865b780a23073750b' 
  AND token = 'NFDDS3hSyo10nq2hkkl/YVj19VWW2vpYd/va+Cory8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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