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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3a20eb83a7869397aff711ae478944242777929a3f259b74e60573c81832f9' 
  AND token = 'zef3goSjUr6HB98mGOPgBc84CgfyGACr5NjZDFofw/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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