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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba087ba5020774a6a906de203d0b40ae82f88855c343af2e1fefa92b91a2a255' 
  AND token = 'gKiWMVMvC4jOvZtLJo3mUci8XjwPKx5d1QVap1m8y58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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