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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '247aca115c7c0bf302827cb11f55e1f2e697b1b30411a17858bd44b0f5955baa' 
  AND token = 'z69NTyvpfq1kdRJbeba/R/wkSxrP7cRawMSlL9CmpFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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