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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70d3a9bf8389b5de18e9eb7734e9da1a0b8d2d178a58a37cc7f617db5a440d0' 
  AND token = 'ZrhBpqBbzgz646gsWS51kNbiXZ41N9KOO5nkqGeI32U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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