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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2874589cb2254646458adab33a609de05cd37e0b532798462ecc07211e3c54e6' 
  AND token = 'SUKtuwvczHurFgp60q4c/nFal56LlW075cp4lORKlEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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