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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bb279d4971542a28aba430a61a2aa8c4f0f596ee47afd71e565b79ca2745d7' 
  AND token = 'G584CaojNmUT1d/RjCpN2T1i/wHn6ibm4sDJa3QBAFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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