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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab7dc653d0cb337bdd06a67a85a0a55ef76477b1f76bcca1751d5291f8d4b7b' 
  AND token = '2p7io607UV2g4ZJIP3XIi2iru8O4bLkw/NYhX2Au5Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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