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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37b57409da788af84827ee24adab8c8fb737b1741f6bae6b5fde433fa2f50d4' 
  AND token = 'T5MjCrdsB/ULNQtei15kAIwAyVnCRbAmg5Pz2BiQryI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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