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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf1f3a4f2c4d837d3066c9042cbc2a3660e54893f4f098770d08a6a2325c837' 
  AND token = 'XMtVboF08NM7Y3DeyVkS3dYgn6Zh0CE7W9W6ReNh+Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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