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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db0d06578dcbabba5ba7f635449b234efa904b660eeedc681a4e86b9e1c8371' 
  AND token = 'EhD4PdM8mLFpEH0AdiNBFUsAbWrp6b6yC6TVdn7784M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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