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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5868353d87acf4914495bb10145747971310f0e8b862ba9198bf7d0ce99c47b8' 
  AND token = 'U/DFUbdCzdWv1DmSfSPjtVu0pEkTamdmYhF8q4WZ2nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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