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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b76f060e55c09309af2fd9d72be531a17c826d6b677db1fccd2a59809cfd59a' 
  AND token = 'mt7QVit96CZHaW4WHEG4bt/z3xdNEn5B4hYP0kJ3AF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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