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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0845336f3bf1b7d55087706a209d6c356da5878f56799c2039aa8751a422eee2' 
  AND token = 'JrUZLOJqiMlU7n0cJ14ayNTxtNqtroUtsVyen81D69M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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