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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dad92d3b2343099e92e3e0c0196adb1a604c4e50b11f0eb53f3a2a7ce23efbc' 
  AND token = 'AbLE2D2tr8jjehBIfxIRRwKBnn+tW8cw9mYqQmL4jNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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