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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25538c2e972a1c8f8cc4b2f4239d627f7d1b4a04b91d9fbf7393b620d59206d' 
  AND token = 'WM4GTPyLQRy1DSpIMRE82s/nM570scVBOA2gzppL61c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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