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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b030403f6d6b84d84fa210f0458148dd5c846481d4e3ccd2cfec36781c91d5' 
  AND token = 'UhO9afY7NA9y6otlmoy817vskLkuQCEiAE1ye5SEsX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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