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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee6c6f326eec763a2e6d2efaf756cfc7d912457a169c44a86f7790a3c601d04' 
  AND token = 'r46yXYsD3X/Y5QXQzXBVy0Eql4C2glpUg2/MiOzwQDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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