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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b1ed2194cff807bc2a7fb67a17f127044eb29e5c157b14920d2dfc43aa73bc' 
  AND token = '2uq/LYuk9Ayx0d8YlmrAOe9hImPEcCiodRQ0lyOMJBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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