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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1f1c6a556b2f2c2f4d20ddbaa05f0254277d978f887addd5df0bb9ce5946b9' 
  AND token = 'przojdFzm9p/5CcVAXRtkwc+KWMHrpVLik9fk52jDgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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