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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ee40b98f83ff5e15ac67764c655523bb6e2d1cce14e7abc49a98aafca15ce1' 
  AND token = 'A5ac6KCXJhl2GH8Nm9vqlb1XkDL/DMJd9HgGnSYuhKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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