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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e962aa4a439058dff65b999268e8625a3fa5fbeb38190fc836859844858bdb54' 
  AND token = '3gvj0t7cwU/pZOiwtwT+xQddcc2B2nAy+umSjDTJMEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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