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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03b15465601c9569b50df1723b02a5abd6a0a774c752d11ecc7d44ea7bdc2ff' 
  AND token = 'assWVNSzP5ZLYJbpNsAuoKLlITnWbPR7HD+thD1zdDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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