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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac0965e9bbc96c516eb3fe74eb9f3edb409da3bc0909a035c95e8dc44576c41' 
  AND token = 'pLTuraGi9kzPvJr1VFHeywhqs1dqIRLV9WzADpRBfbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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