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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf60286c892b9dc4b1d7faa4ac4f9d9141d442b561443bb1421f0190c23bbf6e' 
  AND token = 'NWR/RFhra/UVOA2ABY3yVhKNeWqMpB9YBX7KltCKEIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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