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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc5f32e354fc5e4e50b4b3c75461297631a057585a83058f158e7b1de38ffb7' 
  AND token = 'msrBWvOHnxqczqAFYRa1S5AoInOEbyzfU893Tk/2j68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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