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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bd8255445eef14e2ba61bb705dd20edf974c91d10cf83f218d287700c38ee8' 
  AND token = 'yEGyts5slSU4zrTosnrdQ/M/TfGcuszxxJA4qdCnY6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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