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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b863cadb9ab9b95306f69d2b17135a0e4bcbdbadf88145255a81e5c7bbb86ec1' 
  AND token = '36b1RtReKLDXdENaqHz24c0EnuGPpHw3WyJDFQp2VMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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