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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60e0a6787a10d2bb41376d6d3a6bec7a701d7458487ffe2785430039b8d7f8df' 
  AND token = 'BsajXtC1W83FQYz4Q1vOC3Y1dXE3wSb7ChgsIDasMTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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