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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33b59d92dc8e70ff1477740491fe38152c9e27c5f0cddc538fb80cdf79c23d1' 
  AND token = 'D+yslB4eYssHT3AzVYe56i1ic+dEwdtG7qikkA9xKx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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