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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cd6955023bf52c0081017406637dd0c2e349970b599f1c509227387da4b3bd' 
  AND token = 'vDAs5tmWAB5OMtIehLR1ahvcrdSctU15WpukmHUuJ2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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