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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c282afbfce7574db546140cbcb25db4760a4dea44d94b4c527cf07ae7ef198ca' 
  AND token = 'RbKlT8NEPoCYCTBSf4gLtUQvjroJAr2szBFslFowRc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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