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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f0851c4ad9388d0e20bf3d2632786b27f672482329ae5c202a4c3d65d8ffbb' 
  AND token = 'aqtbVGdf+XGUFzCDg/0mJfToA/GUT1ny+bCZ6MkRFfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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