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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a77e6f8fdc8dc57f8fcce9f717c1634df57f0feaf996daeb1e888226320237a' 
  AND token = 'x1MCoHZ7Z7jrVwtGssd+NkLVPGAH9ueDWdLGt5i+n/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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