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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b18880971ab200835b5a5fc31a2d3c9c880026d99824d3c8b69398d0c12ce6' 
  AND token = 'R7LU9CiM0VAmlhE9yVUP6e4qCNvJLvR+Ms5AMFLcgTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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