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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf1a579cf78054f7e450ab5ee8e20b61c3d2da8b0e9dd1d56b01874a63ac42c' 
  AND token = '7SRil+4TnhBDVIMY7R4/FQBlvTK1WKsrbX2KoNut5XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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