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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe46c45b7ba50fbfc98f5a1e31c6b4c1058f30b481aff358b6ba2dd0dce9fd35' 
  AND token = 'JUJuA8yA2vecAjFS5u4OgmGg5y+DJ0UClI1+bQOSyV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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