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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c0edbfe1192684a7ea81cdb1aedad90a2f002d582b565dd540d22b5a7d3298' 
  AND token = 'wH1P2jpnmwNs8GtB5QUnB2967Q4xy0jHaC2OZjULnnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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