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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bf18d6c439b44c358f3ff547430e3f469f6b1432d8a6d5340bd8f6a68485f2' 
  AND token = 'Zf86U5Vz33hTtrQRhXFchffENR+IY4i5g1jgGfiMsw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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