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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a85d08eb8421cf6598f25d3b731b42f254d2d8d49e37e83a1cd534497186041' 
  AND token = 'bdoHK1PAJ2S0j+Eddb5tPxVLSCX4iEnSpqOOtO41AIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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