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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da3e5a4161de11f9cc1c8ac0748b2d8157d5f546a9b7f14465b3209ebae50c1' 
  AND token = 'e1Ta/dSDLGYU3f3N/al1Ku3DF2Oe81kXAPKFc/Hxk+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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