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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3198066a479645e3ccd396777e18c08deb87b52194a1fd13afb80eb0e7b0f5c' 
  AND token = 'hVczBS7foFeMrEgrDbl5atEBr+uqP3hW7FNKpvXbfGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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