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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b2b6ff1b614ff63beec7310452b0138810e87ff8ce419290dfcdf6ba8634c4' 
  AND token = 'N/JtefLBedCbrCp+4LiaNpS2lAhVq4m6XjZSaX0OPXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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