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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92358c560d94c46d6d9e00e9ba70272e4651727813aeb4d74ad42da4aed7fe37' 
  AND token = 'RqUVGOskoRP8P3z/y3Ji0z5nP8B3sjp34nH3nYxhuYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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