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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7850c85b0b97e5a52d461e26664132e521649e259f3163a6241c4128a3c0497d' 
  AND token = '1FFvfzUaPksdhv4/97Z32oH7ue7JW73kh2qfoxDy3wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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