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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78367760d478d65debef64e10cd869cb961d358f73294989c6a86451852d2b36' 
  AND token = 'Au9Csf/Jz3zqmof59Ar1CjcDnc1KNg+oexylIu+I/v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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