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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db090034949e4b48bda4d4182b98e4597def31c5370acc7e8ef34123ba4874b5' 
  AND token = 'L48ytREVjnMjzUTQpdSq2+qA3orJWqcPisbOf8KS2FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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