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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d2d709e11cd4a5ad3e1c9a6dfb495bbadfc4aaeb64c68185165fc294b6fbd8' 
  AND token = 'bmc5Vbb1xuAurX+3kgCL3/m6i3WrEilTT4gmvbxe4Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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