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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1658ca6b50cd702c349b95328bcbb105f032bcba644f9fcc89da6cd6800bd88a' 
  AND token = 'nHhP/ds6eDNVRv3usu1AoiJQ10ZfvGN++z751CgpwSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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