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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c59645328571ab2f9225e9cb52803e0175337cb67bc287d4580952d8911b3152' 
  AND token = 'ZuidJXfX8p0fv2787pPfIdIqs63JW0HhlXfZ0uLuzmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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