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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9410e869c7d419b40abcc662caf1738ab6abffe68dc70eb34b340d93d512c1ce' 
  AND token = 'dzduMOa7AbZPNp2PIrrFLs+p9gLfG4TeU/HThnIrCK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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