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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530df7f89076a3d2107bbaa734cdfa2c5cd8108c6c2efddddb00779c8a3d00a6' 
  AND token = '+HOSwTrmGbdn9Ti4J/sPSwp/eOxGPyLfvrE4YusG9VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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