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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48772a1432df45dd3e3f9798ee35386e91aca008bc61ab98f42716deca3c058f' 
  AND token = '5ioLomob5UQgEQ+xUN2ECilKMONoE/rFkSzcHuYiCj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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