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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51fe552b6c45fb5d64990c1b26e396d497b6c4cca603e603c5da0c603a494c5' 
  AND token = 'dfF893vxNEUZugRkSug5HSsWx7kFxk2hbVk7fqdwMvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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