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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4052a2ef49f2388f35f1b12447b9b7c545c3d95edc6894a6b44fab9e892702e8' 
  AND token = 'z+Ai55WzTgaX62HcqBEz4R+yfafUc+KjHCDvG8ZKCL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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