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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d58ca3870dce77a713f328e839bde1a2c44266b5358cbd15a87a6314c30cf9' 
  AND token = 'rY1RgTyw1z3PBh6K4QEuxf7LNXOPUTvugbt1veb+RNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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