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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b77b674f185dd1bbc2db10f2211b4544753b1a278103a41478ca47bfca3cba' 
  AND token = 'WivuYzS534RR/+Ugg4KWtyaoHt2dCL1YsH353+mWKRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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